Spell echo and Spell cascade interaction

I have tested these two support gem on Comet and found that only the original cast would be repeated (by echo), the cascaded hit fell at the same time with the repeated one, so the monster could be hit max 4 times (if size were large enough). Besides, in POE1 both the original cast and cascaded would be repeated by echo (max 6 hits on non-awakend cascade). Did they changed the mech. or it just bugged?